instancy vs immediateness

instancy and immediateness both are nouns.

Word	Noun	Adjective	Verb	Adverb
instancy	Yes	No	No	No
immediateness	Yes	No	No	No

As nouns, instancy and immediateness are synonyms defined as:

Other synonyms of instancy include immediacy, instantaneousness.

instancy (noun)	immediateness (noun)
the quality of being insistent	the quickness of action or occurrence
the quickness of action or occurrence	lack of an intervening or mediating agency